Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Michelle, the problem is getting the subscription to work. If you can get it work there is no reason why you shouldn't use it maybe Microsoft will be happy is at the end of the year you have found that you cannot do without it and pay for a further subscription.
PS: "would only enable me to use it for the year on that particular device" I don't accept that. If you were to activate it on your computer you would be able to install it on 5 other devices.